Print Screen Key no longer working in Windows 7?

I am running Windows 7 64-bit. I can't get my PrtScn key to capture my screen so I can paste it to another program. I used to be able to do this in XP, and even in my wife's 64-bit Vista. It could also be my MS wireless keyboard 1.1, which as proven
to be buggy and requires update fixes from MS.

Anyone else having print screen troubles?

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Question Info

To everyone still having a problem with Print Screen, and none of the proposed solutions work: I have your answer!

I recently bought a brand new laptop, and I'm running both Ubuntu 10.04 and Windows 7. I'm a Simmer, and I was getting more and more frustrated that I could not capture the screen on my Sims game so I can share my CC. Nothing anyone on here said worked,
and then I found this.

As you are using a wireless keyboard I would suggest you to check on the F LOCK (function lock) key on your keyboard. Check on the top right of your Keyboard for the F Lock Key, which may be stopping you from using the print screen key.
The F LOCK key toggles the alternate function keys. An alternate function key is a key that has two possible commands depending on the F LOCK toggle key state.